16668451 has 2 divisors, whose sum is σ = 16668452. Its totient is φ = 16668450.

The previous prime is 16668419. The next prime is 16668467. The reversal of 16668451 is 15486661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16668451 - 2⁵ = 16668419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16668451.

It is not a weakly prime, because it can be changed into another prime (16668401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334225 + 8334226.

It is an arithmetic number, because the mean of its divisors is an integer number (8334226).

Almost surely, 2^16668451 is an apocalyptic number.

16668451 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668451 is an equidigital number, since it uses as much as digits as its factorization.

16668451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 16668451 is about 4082.7014340997. The cubic root of 16668451 is about 255.4455928157.

The spelling of 16668451 in words is "sixteen million, six hundred sixty-eight thousand, four hundred fifty-one".